William s



W. S. JOHNSON.

l .Buggy-Axle Tap. No. 73,530. Patented Jan. 21, 1868.

@nim ffwfm ffift.

IMPROVEMENT IN sucer-TAPS.

ilge .rlnhtle tetmh tif in that eits at-nrt gant makiuglymct iff tigesame.

T0 WHOM IT MAY CONCERN:

Be it known that I, WILLIAM S, JOHNSON, of Henderson, Henderson county,Kentucky,l have invented a new and usefulImpi-ovemen't in Bugg -Taps;and I hereby declare the following to be a full, clear, and exactdescription thereof, reference being had to the accompanying drawings,making part of this specification.

My invention consists in a provision whereby the tap may be at all timesset, and firmly held to such degree of proximity to the boxing, as, onthe one hand, to avoid undue friction, and, on the other hand, to avoidall jostling and rattling ofthe parts; and this, whether the washersbenew or nearly worn out. In the accompanying drawingsl i Figure 1` showsthe axle-arm by side elevation, and the other parts in axial section.

Figure 2 is a perspective view of the tap. with another form oftemper-screw.

A. is an axle-arm orjournal, terminating'at its outer and inner yends,respectively, in the customary screw, B, and collar (l. D is a,customary bush or boxing. E is the nu-t or tap proper, adapted to screwupon the portion B.l The screw-threaded orifice e, ofthe tap E, passesentirely .through the latter, and receives atemper-v screw, F, which,beingl set more or less forward into the tap, affords an adjustableshoulder or abutment for the tap, against thevend of the axle-screw, andsets an exact and controllable .limit to the advance of the tap. G and Hare respectively the outer and inner washers. i

The operation of my improvement is-as follows: After the insertionvot`new washers, the temper-screw F is screwed just far enough inward toallow the tap to snugly confine the colla-r Gr, without pressing on itso tightly as to cause undue friction of the boxing either against thewashers or axle. As the washers become worn, so as to loosen the boxing,the latter may be restored to its proper bearing vby a slight retractionof the temper-screw, without the customary insertion of new washers,with their attendant binding and-friction. One set of washers, on myplan, may be made to outlast several in the ordinary way, and performbetter service, and with less injury to the parts. '.lhe temper-screw Fcannot he easily lost, from jostling, because the pressurev against theendo` the spindle forces the threads firmly together,4 and holds boththe screw Fand the tap E Asecurely in place.

I claim herein as new, and of my inventionl A buggy-tap, E, whosescrew-threaded orifice, e, is prolonged to its outer end, and providedwith a temperscrew, F, adapted to operate as set forth.

In testimony of `which invention, I hereunto set my hand.

WILLIAM s. JHNSON.

Witnesses:

Gao. H. KNIGHT,

JAMES HILL.

